Yes, the header of business transactions are stored in table CRMD_ORDERADM_H. With the header GUID you can find the partners in table CRMV_LINKPARTNER or (CRMD_ORDERADM_H -> CRMD_LINK (GUID_HI = CRMD_ORDERADM_H-GUID and OBJTYPE_SET=07) -> CRMD_PARTNER (GUID = CRMD_LINK-GUID_SET)